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Acquisitions - Progressive Acquisition Narrative (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Apr. 14, 2014
Business Acquisition [Line Items]      
Acquisitions of businesses and contracts $ 16,841 $ 695,765  
Progressive      
Business Acquisition [Line Items]      
Business acquisition, percentage of voting interests acquired     100.00%